TWI679936B - Liquid absorbing wick for heat-transpiration, method for producing same, and heat- transpiration method using of the same - Google Patents

Abstract

Provided is a wick for heating and transpiration that can be used for transpiration of a medicinal solution containing a relatively high vapor pressure pyrethroid-based insecticidal component. Of course, stable evapotranspiration performance and high insecticidal efficiency can be achieved during use. It can prevent the leakage of medicinal solution caused by the increase of the internal pressure of the medicinal solution container or the overturn of the medicinal solution container, and it can maintain the evapotranspiration performance of the wick for a certain period of time from manufacture. core.

Liquid wick for heating evapotranspiration, used for evapotranspiration of medicinal solution containing pyrethroid insecticidal ingredients having a vapor pressure of 2 × 10 ^-4 to 1 × 10 ^-2 mmHg at 30 ° C., including inorganic powder and the inorganic binder and an organic substance as raw material in the raw material, the inorganic powder and inorganic binder total weight (W _1), the weight (W ₂₎ of organic material ratio (W ₁ / W ₂₎ is set to 4.0 ~ 10.

Description

Use of heating evapotranspiration core for evapotranspiration of aqueous prescription drug liquid, manufacturing method of heating evapotranspiration wick, and heating evapotranspiration method

The invention relates to a liquid wick for heating and transpiration used for evapotranspiration of a medicinal solution containing a relatively high vapor pressure pyrethroid-based insecticidal component, a manufacturing method thereof, and a liquid wick for heating and transpiration. Heating evapotranspiration method.

As a flying pest control product for controlling flying insects such as mosquitoes, a liquid wick is immersed in a chemical liquid containing an insecticidal component, and the absorbed liquid is guided to the upper part of the liquid wick, and the suction The so-called [mosquito coil liquid] in which the liquid core is heated to evaporate the insecticidal component into the atmosphere has been sold on the market. The insecticidal component of mosquito coil liquid is generally a pyrethroid insecticidal component. Pyrethroid-based insecticidal components In the past, allethrin, prallethrin, furamethrin, etc. have been the mainstream, but in recent years, they have been worshipped for their excellent insecticidal activity. The tendency for new insecticidal ingredients such as transfluthrin and metofluthrin to be used.

In addition, the medicinal solution used in the mosquito-repellent liquid has an oily formula using kerosene as a base, and a liquid formula using water as a base. Water-based prescription. Although mosquito-repellent liquids have been dominated by oily prescriptions in the world so far, water-based prescriptions can reduce the risk of pyrotechnics compared with oily prescriptions, and it is easy to enhance the insecticidal effect on pests. Therefore, the demand for water-based prescriptions is expected Will increase.

As wicks for medicinal liquids applicable to aqueous formulations, for example, wicks obtained by firing a mixture of inorganic powder, organic substance, and inorganic binder at 600 to 2000 ° C. have been known (for example, refer to Patent Literature) 1). The liquid wick of Patent Document 1 is a medicinal solution containing a conventional pyrethroid-based insecticidal ingredient including acryl pyrethrin, puyalenin, and fenvalerate, and is shown to be suitable for blending with polyoxidation Polyoxyalkylene alkyl ether based solubilizer is an aqueous insecticide.

[Patent Document 1]: Japanese Unexamined Patent Publication No. 4-117303

However, since the mosquito coil liquid is a product that continues to be used for a long period of time, when designing a liquid wick for heating and transpiration, it is necessary to fully consider the properties of the drug contained in the liquid used for the liquid Liquid core materials or processes work hard. In this regard, since the liquid absorbent core of Patent Document 1 does not use a starch-like paste (organic binder), it can be said that if it contains conventional pyrethrin, puyalenin, and fenvalerate, etc. In the case of an aqueous formulation of a pyrethroid-based insecticidal component, physical deterioration of the wick is difficult to occur. However, is the liquid wick of Patent Document 1 applicable to medicines containing new pyrethroid-based insecticidal ingredients such as byfunin and metenin? The fluid is still unknown. Compared with the new insecticidal components of the new pyrethroids such as Byfenine and Metnin, compared with the conventional insecticidal components such as propylene pyrethrum, puyalenin, and fenvalerate, their properties are also high. different. Therefore, even if the liquid wick of Patent Document 1 is used intact for a medicinal solution containing a pyrethroid-based insecticidal component having a relatively high vapor pressure, it is unknown whether the anti-insectant performance can be exhibited. In this way, there is a possibility that the liquid wick may be deteriorated by the chemical solution.

In addition, if the conventional wicks such as Patent Document 1 are filled with a medicinal solution and the period from when the wick is actually used (until the wick is heated) becomes longer, a mosquito coil can be seen. The effective period of the liquid tends to be shorter, leaving room for improvement regarding the stability of the evapotranspiration performance of the wick.

The present invention has been made in view of the above problems, and an object thereof is to provide a wick for heating and transpiration that can be used for transpiration of a medicinal solution containing a relatively high vapor pressure pyrethroid insecticidal component, Of course, stable evapotranspiration performance and high insecticidal effect can be achieved during use, which can prevent the leakage of the medicinal solution caused by the increase in the internal pressure of the medicinal solution container or the leak of the medicinal solution caused by the overturning of the medicinal solution container, and a certain period of time has passed since the manufacture Liquid wick for heating evapotranspiration which can also maintain the evapotranspiration performance of the liquid wick. Furthermore, an object of the present invention is to provide a method for producing such a liquid wick for heating and transpiration, and a method for heating and transpiration using the same.

The liquid wick for heating and transpiration related to the present invention for solving the above-mentioned problems is characterized in that: a liquid wick for heating and evapotranspiration is used for evapotranspiration of an aqueous prescription medicinal solution, and the vapor pressure at 30 ° C is 2 × 10 ^-4 ~ 1 × 10 ^-2 mmHg pyrethroid-based insecticidal ingredients, and glycol-ether compounds and / or glycol-based compounds with a boiling point of 150 to 300 ° C The compound, an evapotranspiration solution of an aqueous formula with water, includes inorganic powders, inorganic binders, and organic substances as raw materials. In the aforementioned raw materials, the total weight of the inorganic powders and the inorganic binders (W ₁ ), and The ratio (W ₁ / W ₂ ) of the weight (W ₂ ) of the organic substance is set to 4.0 to 10.

The organic substance preferably contains a carbonaceous powder, and the carbonaceous powder is preferably at least one selected from the group consisting of graphite, carbon black, activated carbon, charcoal, and coke.

It is preferable that the organic substance further contains an organic binder.

The pyrethroid-based insecticidal component is preferably at least one selected from the group consisting of byfunin, metenin, and profluthrin.

The inorganic powder is selected from the group consisting of mica, alumina, silica, talc, mullitn, cordierite, and zirconia. At least one of the formed groups is preferred.

The inorganic binder is preferably at least one selected from the group consisting of clay, bentonite, halloysite, and tar pitch.

According to the wick for heating evapotranspiration according to the present invention, since a suitable raw material is selected as a wick for heating evapotranspiration, and each raw material is mixed at an appropriate ratio, the wick for heating evapotranspiration can be stabilized when used. Coexistence of evapotranspiration and high insecticidal efficacy can prevent internal pressure caused by the content of the medicinal solution Liquid leakage caused by rising liquid or liquid container caused by overturning of liquid container. In addition, such a liquid wick for heating and transpiration can maintain the evapotranspiration performance of the liquid wick for a certain period of time from its manufacture, and has become a highly practical liquid wick for heating and transpiration.

The method for manufacturing a wick for heating and transpiration related to the present invention to solve the above-mentioned problems is characterized in that: A method for manufacturing a wick for heating and transpiration is to make the vapor pressure at 30 ° C. to 2 × 10 ^-4 ~ 1 × 10 ^-2 mmHg of pyrethroid-based insecticidal ingredients, and glycol ether-based compounds and / or glycol-based compounds with a boiling point of 150-300 ° C, and water-based prescription of water A manufacturing method of a liquid wick for heating and transpiration of a medical prescription evapotranspiration, comprising: a mixing process of mixing an inorganic powder with an inorganic binder and an organic substance as raw materials; and a firing process of firing the mixed raw materials In the mixing process, the raw materials are prepared so that the ratio (W ₁ / W ₂ ) of the total weight (W ₁ ) of the inorganic powder and the inorganic binder to the weight (W ₂ ) of the organic substance is 4.0. ~ 10.

The aforementioned firing process is preferably performed at 600 to 2000 ° C.

According to the method for manufacturing a liquid wick for heating evapotranspiration according to the present invention, since the mixing process and the firing process are performed under appropriate conditions, a liquid wick for heating evapotranspiration having high practicality can be manufactured as described above.

The characteristics of the heating evapotranspiration method related to the present invention for solving the above-mentioned problems are as follows: A method for heating and transpiration in the above-mentioned application, in which the liquid wick for heating and transpiration is immersed in the medical liquid, and the absorbed medical liquid is guided to The upper part of the wick for heating and transpiration is heated at 60 to 130 ° C. to evaporate the pyrethroid insecticidal component into the atmosphere.

According to the heating evapotranspiration method of the present invention, since the liquid wick for heating evapotranspiration is used for the heating evapotranspiration of the chemical liquid, the stable evapotranspiration performance and high insecticidal efficacy can coexist, and the internal pressure due to the content of the chemical liquid can be prevented Liquid leakage caused by rising liquid or liquid container caused by overturning of liquid container. In addition, since the evapotranspiration performance of the wick can be maintained, it becomes a highly practical wick for heating evapotranspiration.

Hereinafter, the liquid wick for heating and transpiration of the present invention, a method for manufacturing the same, and a heating evapotranspiration method using the liquid wick for heating and transpiration will be described. However, the present invention is not intended to be limited to the embodiments or examples described below.

The liquid medicine for mosquito-repellent liquid (hereinafter referred to as "medicine solution") which can be applied to the wick for heating and transpiration of the present invention contains a pseudo-except for a vapor pressure of 2 × 10 ^-4 to 1 × 10 ^-2 mmHg at 30 ° C. Insecticides. Examples of the pyrethroid insecticidal component include byfunin, metenin, perfluthrin, empenthrin, terallethrin, and cyfluthrin ( meperfluthrin), heptafluthrin, 4-methoxymethyl-2,3,5,6-tetrafluorobenzyl-chrysanthemate ) And 4-methoxymethyl-2,3,5,6-tetrafluorobenzyl-2,2-dimethyl-3- (2-chloro-2-trifluoromethylvinyl) cyclopropanecarboxylate Esters (4-methoxymethyl-2,3,5,6-tetrafluorobenzyl-2,2-dimethyl-3- (2-chloro-2-trifluoromethylvinyl) cyclopropanecarboxylate) and the like. Among them, if considering evapotranspiration, insecticidal efficacy, stability, etc., Byfunin, Metnin and Permethrin are better, Byfunin is better. The above-mentioned pyrethroid insecticidal ingredients may be used alone or in a mixture of a plurality of types. Further, in the pyrethroid insecticidal component, an optical isomer or a geometric isomer based on an asymmetric carbon exists in the acid portion or the alcohol portion, Optical isomers and geometric isomers are also included in the pyrethroid-based insecticidal component which can be used in the present invention.

The content of the pyrethroid insecticidal component in the medicinal solution is preferably 0.1 to 3.0% by mass. When the content is less than 0.1% by mass, the insecticidal effect may be reduced. On the other hand, if the content exceeds 3.0% by mass, the properties of the medicinal solution may be impaired.

Either kerosene (oily prescription) or water (aqueous prescription) can be used as the solvent contained in the medicinal solution. However, as described above, the water-based prescription can reduce the risk of fireworks and enhance the insecticidal effect on pests compared with oily prescriptions. It becomes easy, so the water-based prescription is better. In the case of an aqueous formulation, a glycol ether compound and / or a glycol compound having a boiling point of 150 to 300 ° C, preferably 200 to 260 ° C, and a pyrethroid insecticidal component are preferably blended together. Glycol ether compounds and / or glycol compounds have the following effects: (1) solubilization of the pyrethroid insecticidal component (solubilization), (2), improving heat evapotranspiration, ( 3) Between the pyrethroid insecticidal component and water, maintain a certain ratio to make the three components evapotranspiration. Further sensitivity of glycol ether compounds and / or glycol compounds to pyrethroids (sensitivity) pests can also act as a [potency enhancer], and even in the case of a pest with reduced sensitivity, the effect of reducing the degree of reduction of insecticidal efficacy is also recognized.

The content of the glycol ether compound and / or the glycol compound in the chemical solution is preferably 10 to 70% by mass, and more preferably 30 to 60% by mass. When the content is less than 10% by mass, not only the preparation of the aqueous solution is hindered, but also the effect as an effect enhancer and the effect of reducing the degree of reduction of the insecticidal effect are lacking. On the other hand, even if the content exceeds 70% by mass, not only the insecticidal effect reaches its apex, but also the danger to pyrotechnics will increase, which may impair the advantages of the water-based prescription.

Examples of the glycol ether compounds and / or glycol compounds include diethylene glycol monoethyl ether (boiling point: 202 ° C), diethylene glycol monoisopropyl ether) (boiling point: 207 ° C, followed by DEMIP), diethylene glycol monobutyl ether (boiling point: 231 ° C, then DEMB), diethylene glycol monoisobutyl ether ) (Boiling point: 220 ° C, followed by DEMIB), diethylene glycol monohexyl ether (boiling point: 259 ° C, then DEMH), diethylene glycol mono-2-ethylhexyl ether mono-2-ethylhexyl ether (boiling point: 272 ° C), diethylene glycol monophenyl ether (boiling point: 283 ° C), triethylene glycol monomethyl ether (boiling point: 249 ℃), propylene glycol mono tertiary butyl ether (boiling point: 151 ℃), dipropylene glycol monomethyl ether glycol monomethyl ether (boiling point: 188 ° C), dipropylene glycol monopropyl ether (boiling point: 210 ° C, followed by DPMP), 3-methoxy-1,2-propanediol (3-methoxy-1 , 2-propanediol) (boiling point: 220 ° C), hexylene glycol (boiling point: 197 ° C, and then HG), and the like. Among them, diethylene glycol monoethyl ether, diethylene glycol monoisopropyl ether, diethylene glycol monobutyl ether, diethylene glycol monoisobutyl ether, diethylene glycol monohexyl ether are preferred, and diethylene glycol monobutyl ether Ether is better. The above-mentioned glycol ether compounds and / or glycol compounds may be used singly or in a mixture of plural kinds.

When a chemical solution is prepared as an oily prescription, a hydrocarbon-based solvent such as kerosene having a boiling point of 150 to 350 ° C is used. As an example of the hydrocarbon-based solvent, a saturated aliphatic having 12 or more carbon atoms or a normal paraffin equivalent to an alicyclic hydrocarbon, isoparaffin, and a naphthenic hydrocarbon ( naphthenic hydrocarbon). The above-mentioned hydrocarbon-based solvents may be used singly or in a mixed state.

Various other ingredients can be added to the medicinal solution. For example, it is suitable to mix with other pyrethroid-based insecticidal ingredients such as acryl pyrethrum and puyalenin; repellent ingredients such as DEET, terpene-based compounds, natural essential oils and fragrances; antibacterial agents Antifungal agent; stabilizers like dibutylhydroxytoluene (BHT), p-hydroxybenzoic acid methyl ester; pH adjuster A colorant; a deodorant such as a tea extract or a tea retort may be used; and In addition, when preparing a medicinal solution for aqueous or oily formulations, in addition to water, it is suitable to use: lower alcohols such as ethanol and isopropanol; and hydrocarbon systems such as kerosene Solvents: Ester-based or ether-based solvents, solubilizers, and dispersants may be used. The medicinal solution prepared in this manner is filled in a container body (not shown) provided with a liquid wick for heating and transpiration, and constitutes a pest control product (mosquito coil liquid).

The container for storing the medicinal solution is generally a polyolefin such as polypropylene; a plastic container such as polyester and polyvinyl chloride. A liquid wick is mounted on the upper part of the medicinal solution container through an inner plug. In the case of an aqueous formulation, the material of the medicinal solution container takes into consideration the physical properties of the glycol ether compound and / or the glycol compound, and a polyolefin plastic such as polypropylene is preferred.

However, the wicking cores for heating and transpiration of mosquito-repellent liquid are generally divided into fired cores, button cores, and sticky cores according to the general classification. However, the inventors repeatedly focused on various wicking cores and found that it contains inorganic powder With inorganic binders and organic substances as raw materials. In this raw material, the ratio of the total weight of the inorganic powder and the inorganic binder (W ₁ ) to the weight of the organic substances (W ₂ ) (W ₁ / W ₂ ) Those who set it to 4.0 to 10 are physically and chemically stable to a solution containing a pyrethroid-based insecticidal component having a vapor pressure of 2 × 10 ^-4 to 1 × 10 ^-2 mmHg at 30 ° C. The capillary phenomenon effectively absorbs the medicinal solution, and even if the time period (i.e., the period until the start of heating of the wick start) is increased after the wick is filled in the medicinal solution and used, the effective use is not caused. The worry of shortening the period can maintain the excellent evapotranspiration performance of the wick throughout the entire period from the time of manufacture to the time of use, and it can prevent the leakage of chemical liquid or Liquid medicine caused by overturning of liquid medicine container Leak, and to complete the present invention.

Here, when the wick for heating and transpiration is a fired core, a mixture containing (a), an inorganic powder, (b), an inorganic binder, and (c), and an organic substance can be prepared at 600 to 2000 ° C. It is obtained by firing, and the blending amounts of (b) and (c) are small, and those formed only by (a) are often referred to as porous ceramic cores.

Examples of the inorganic powder include mica, alumina, silica, talc, mullite, cordierite, and zirconia. Among them, mica is a better material because it can form relatively uniform fine pores in the wick for heating and transpiration of mosquito coil liquid. The inorganic powders listed above can be used alone or in a mixture of a plurality of types. The content of the inorganic powder in the wick for heating and transpiration is preferably 10 to 90% by mass, and more preferably 30 to 70% by mass. The shape of the inorganic powder is preferably in the form of a fine powder having a mesh size of 50 mesh or less in terms of physical properties such as appearance, liquid absorption, and strength. However, in the process of heating the wick for evapotranspiration, it is not limited to a case involving a process such as pulverization.

Examples of the inorganic binder include various clays such as clay (kaolin clay), bentonite, and kaolin clay; tar pitch; and water glass. Among them, clay is a better material because of its excellent cohesiveness. The inorganic binders listed above can be used singly or in a mixed state. The content of the inorganic binder in the wick for heating and transpiration is preferably 5 to 50% by mass, and 10 to 40 Better quality%. Although the inorganic bonding agent lacks the bonding effect at normal temperature, it exhibits sufficient bonding effect by firing at 600 ~ 2000 ° C, and is suitable for use as a wick for heating and transpiration.

Examples of the organic substance include carbonaceous powders such as graphite, carbon black, activated carbon, charcoal, and coke, or carboxymethyl cellulose (CMC) and acrylic resin. , Polyolefin resin (polyolefin resin) and other organic binders. Among them, graphite is a better material because of its more uniform shape and less impurities. When a carbonaceous powder such as graphite is blended, the appearance, hue, liquid absorbency, strength, etc. of the wick for heating and transpiration can be improved. The carbonaceous powders or organic binders listed above can be used alone or in a mixed state. The content of the organic substance in the wick for heating and transpiration is preferably 5 to 40% by mass. Within this range, continuous pores can be generated in the wick for heating and transpiration by generating a gas such as carbon monoxide or carbon dioxide during the process of firing the wick for heating and transpiration. Full porous structure.

In addition, the wick for heating and transpiration is suitably added in addition to the above substances: preservatives, 4,4'-methylenebis (2-methyl-6-tertiary butylphenol) (4,4'-methylenebis (2 -methyl-6-tert-butylphenol)), β- (3,5-di-tert-butyl-4-hydroxyphenyl) stearate (stearyl-β- (3,5-di-t- Antioxidants such as butyl-4-hydroxy phenyl) propionate) may also be used.

However, if the conventional fired core is filled with a liquid wick, the time period until the use of the liquid wick (that is, the period until the heating of the liquid wick is started) becomes longer, even though the properties of the liquid wick are longer. No effect, but often the effective period will be shortened, and the stability of the evapotranspiration performance of the wick still leaves room for improvement. In this regard, the present inventors conducted a further improvement review and found that as a pyrethroid insecticidal component, a vapor pressure at 30 ° C of 2 × 10 ^-4 to 1 × 10 ^-2 mmHg was used. In the range of pyrethroid insecticidal ingredients, if the raw materials of the fired core are blended, the total weight of the inorganic powder and the inorganic binder (W ₁ ) and the weight of the organic substance (W ₂ ) are adjusted. When the ratio (W ₁ / W ₂ ) is 4.0 to 10, the aforementioned problems can be solved. How the aforementioned ratio (W ₁ / W ₂ ) participates in stabilizing the evapotranspiration performance of the wick during the lapse of time before use has not yet been fully confirmed, but it is considered that the fine pores generated by the inorganic powder and the The porous pores generated by the burning and dissolving of organic substances are effectively distributed inside the wick, which contributes to the stabilization of the evapotranspiration performance. Furthermore, it is presumed that the distribution state of the fine pores and the porous pores on the surface of the wick is maintained at a moderate level with the inner plug, which will be described later, to prevent leakage of the medicinal solution.

The thus obtained wick for heating and transpiration of the present invention is suitable for a liquid product in which a medicinal solution is heated and evapotranspiration through the wick. That is, the medicinal solution is stored in a medicinal solution container, and the lower part of the wick for heating and transpiration is immersed in the medicinal solution through the inner plug. Then, the medicinal solution in the medicinal solution container is guided to the upper part of the liquid wick for heating and transpiration, and is heated to 60 to 130 ° C. by a heating element arranged on the upper part of the heating and transpiration device and evaporated to the atmosphere. The evapotranspiration core for heating and evaporation is provided with a gap between the hollow cylindrical heat-dissipating cylinder constituting the heating element, and faces the surface temperature of the purpose of heating the upper part of the evapotranspiration wick (for example, 60 to 130 ° C). By setting the heating element The temperature is higher than the target surface temperature of the upper part of the wick (for example, 80 ~ 150 ° C). If the heating temperature of the medicinal solution is too high, the medicinal solution may evaporate early, or may cause thermal decomposition or polymerization of the medicinal solution. As a result, high-boiling substances are generated on the surface of the wick, and high-boiling substances are accumulated to cause meshes. The risk of clogging. On the other hand, if the heating temperature is too low, it is difficult for the medicinal solution to evaporate, and sufficient insect resistance cannot be achieved.

In addition to the heating element described above, the heating and evapotranspiration device used in the liquid wick for heating and evapotranspiration of the present invention may be configured with various functions or components attached to conventional devices. A safety upper protective cover is carried on the upper part of the heating element, and an opening is formed in the central part thereof, and the size and shape can be arbitrary as long as the evaporative medicine liquid does not excessively condense and adhere to the protective cover or the body. For example, it is effective to suspend a cylindrical evapotranspiration tube with an inner diameter of 10 to 30 mm from the vicinity of the opening. In this case, the distance from the lower end of the evapotranspiration tube to the top surface of the heating element is usually 1 ~ A range of 5 mm is preferred. Further, a power cord, an ON / OFF operation switch, a pilot lamp, and the like connected to the heating element may be suitably attached.

According to the heating evapotranspiration method using the liquid wick for heating evapotranspiration according to the present invention, the pyrethroid sensitivity system in the living room, living room, bedroom, etc., of course, not only reduces the sensitivity to Culex pipiens house mosquitoes such as pallens, Culex tritaeniorhynchus, Culex quinquefasciatus, Culex pipiens molestus, etc .; Aedes aegypti, Aedes albopictus, etc. Aedes, midges, etc., for housefly, butterfly flies (psychodidae), phorid fly, pupa Other harmful flying insects such as horsefly, black fly, and biting midge also exhibit practical insecticidal efficacy, and are extremely useful.

[Example]

Next, the liquid wick for heating and transpiration of the present invention and the heating evapotranspiration method using the liquid wick for heating and transpiration according to the present invention will be described in more detail based on specific examples.

[Example 1]

Formulated with 0.9% by mass of Byfunin, 50% by mass of diethylene glycol monobutyl ether (DEMB), 0.1% by mass of dibutylhydroxytoluene (BHT) as stabilizer, and 49% by mass of purified water ) To prepare an aqueous prescription drug solution.

Water was added to contain 55% by mass of mica powder as an inorganic powder, 32% by mass of clay powder as an inorganic binder, 10% by mass of graphite as an organic substance, and 3% by mass of an organic binder. The carboxymethyl cellulose was mixed and kneaded. The kneaded material was extruded while being pressurized, and then air-dried at 1000 ° C to obtain a wick for heating and transpiration (a round rod with a diameter of 7 mm and a length of 66 mm) of Example 1. ). Heating the absorbent core with evapotranspiration, mica powder, clay and the total weight (W _1), the weight ratio of the composition ratio of graphite (W ₂₎ of (W ₁ / W ₂₎ was 6.7.

Fill a plastic container with 45mL of water-based prescription drug solution, fill the wick for heating and transpiration through the inner plug, and then install it in a heating evapotranspiration device [for example, a device described in Japanese Patent No. 2926172, etc. to dissipate heat in a hollow tube shape. A cylinder (inner diameter: 10 mm, height: 10 mm, surface temperature: 137 ° C) was installed around the upper portion of the wick], and a pest control product was produced. The pest control product was placed in the center of a 6-tatami room (25 m ³ ), and after being used for 12 hours every day, it was kept from being bitten by mosquitoes for 60 days (about 700 hours).

[Examples 2 to 9, Comparative Examples 1 to 4]

The chemical liquid used in Examples 2 to 9 and the liquid wick for heating and transpiration were prepared in accordance with Example 1, and the chemical liquid and the liquid wick for heating and evapotranspiration were filled in a heating evapotranspiration device to prepare the pest control of Examples 2 to 9. product. Then, each of the pest control products was subjected to the measurements and tests (1) to (3) described later. In addition, for the sake of comparison, the same measurements and tests were performed on the pest control products of Comparative Examples 1 to 4. Table 1 shows the prescriptions of the medicinal solutions and the blending of the wicks for heating and transpiration in the examples and comparative examples. In addition, the prescription and formulation of Example 1 are also described in Table 1.

[Table 1]

(1) Evapotranspiration performance

A test evapotranspiration device was placed in the center of a 6-tatami room (25m ³ ), and electric heating was performed. At a predetermined time, traps were made with a silica gel packed column, and the insecticidal components were extracted with acetone. Then, the insecticidal components were determined by gas chromatography analysis per unit time. Evapotranspiration. Evapotranspiration performance is calculated from the initial period of use (the second day of use), the middle period of use (the day with an effective period of approximately 50% remaining), and the later period of use (a few days before the period of validity).

(2), insecticidal efficacy test

A plastic cylinder with an inner diameter of 20 cm and a height of 43 cm is overlapped in two sections. A cylinder with an inner diameter of 20 cm and a height of 20 cm is placed on the 16-mesh wire (placed in the place for testing insects). A mesh wire is separated from the upper surface, and a cylinder having the same diameter and a height of 20 cm is placed thereon. The four overlapping cylinders were placed on a circular plate placed on a table with a rubber packing interposed therebetween. A circular hole having a diameter of 5 cm was provided in the center of the circular plate, and a heating evapotranspiration device was installed on the circular hole, and electric heating was performed. After 4 hours of application of electricity, about 20 female adults of Culex pipiens pallens tested were released into the upper third cylinder. Calculate the test insects falling down over time and find the KT ₅₀ value. Furthermore, all test insects were recovered after 20 minutes of exposure and the mortality rate of all the test insects was investigated after 24 hours. The insecticidal efficacy test was carried out in the initial period of use (the second day of use) and the later period of use (a few days before the expiration date).

(3) Shortening rate

In order to evaluate the evapotranspiration performance of the wick in the market Stability. After filling the medicinal solution into a plastic container, a wick is set and stored at 40 ° C. Samples before the start of storage and after 6 months (corresponding to 3 years under normal room temperature conditions) were loaded into a predetermined heating evapotranspiration device to perform a use test, and each effective use day was determined. Then calculate the shortening rate = [days of samples after 6 months] / [days of samples before storage starts], and use this as an indicator of stability over time.

The test results in each example and comparative example are shown in Table 2.

[Table 2]

As a result of the test, the ratio of the total weight (W ₁ ) of the inorganic powder and the inorganic binder to the weight (W ₂ ) of the organic substance due to the total weight (W ₁ ) of the inorganic powder and the inorganic binder in the wicks for heating and transpiration of Examples 1 to 9 (W ₁ / W ₂ ) It is set to 4.0 ~ 10, so of course it achieves stable evapotranspiration performance and high insecticidal effect during use. It can prevent the leakage of the medicinal solution caused by the increase of the inner pressure of the medicinal solution container or the medicinal solution caused by the overturn of the medicinal solution container. Even if the time period from the time the liquid wick is filled to the time when it is powered on is used, the effective use period will not be substantially shortened, and the wick can be maintained for the entire period from the time of manufacture to the time after use. Excellent evapotranspiration performance. In this way, it was confirmed that the liquid wick for heating and transpiration of the present invention is extremely effective in controlling flying insects, especially mosquitoes. In addition, for example, in comparison between Example 8 and Example 9, when an aqueous medicinal solution is used, as the glycol ether compound and / or the glycol compound, a boiling point in the range of 150 to 300 ° C. is preferred. In addition, the raw materials for firing the core are suitable to use mica as an inorganic powder, clay as an inorganic binder, and graphite as a carbon powder.

In contrast, the total weight of inorganic powder and inorganic binder of (W _1), the ratio of the weight of organic matter (W is ₂₎ The (W ₁ / W ₂₎ from the liquid-absorbent Comparative Examples 4.0 to 10 2 to 4 Although the wick has no inferiority to the wick of the example immediately after its manufacture, it can show relatively stable evapotranspiration performance and high insecticidal efficacy, but the time period after the wick is filled in the liquid medicine and used until it is powered on is long. The tendency to shorten the effective use period is recognized. Furthermore, as in Comparative Example 1, the d1‧d-T80-propyrethrum with respect to the vapor pressure of the insecticidal component deviating from the range of 2 × 10 ^-4 to 1 × 10 ^-2 mmHg, even if the above ratio (W ₁ / W ₂ ) In the range of 4.0 to 10, not only satisfactory evapotranspiration performance and insecticidal efficacy are not obtained, but also a shortened period of effective use.

The present invention can be used in pest control products for humans and pets, and can also be used in other applications such as insecticidal, acaricidal, sterilizing, antibacterial, deodorizing and deodorizing.

Claims (10)

A liquid wick for heating and transpiration is used for the transpiration of aqueous prescription liquid medicine, and is used to contain a pyrethroid-based insecticidal component having a vapor pressure at 30 ° C of 2 × 10 ^-4 to 1 × 10 ^-2 mmHg, With glycol ether compounds and / or glycol compounds with a boiling point of 150 to 300 ° C, and water-based prescription chemical liquid evapotranspiration, containing inorganic powders, inorganic binders and organic substances as raw materials. raw material, the inorganic powder and the inorganic binders of the total weight (W _1), the weight ratio of the organic material (W ₂₎ to (W ₁ / W ₂₎ is set to 4.0 to 10. For example, the application in the scope of patent application, wherein the organic substance includes carbonaceous powder. For example, the application in the second scope of the patent application, wherein the organic substance further includes an organic binder. If the application of any one of items 1 to 3 of the scope of the patent application, wherein the pyrethroid insecticidal component is selected from the group consisting of transfluthrin, metofluthrin and propyl fluoride At least one of the group consisting of permethrin. For example, the use of any one of items 1 to 3 of the patent scope, wherein the inorganic powder is selected from the group consisting of mica, alumina, silica, talc, mullite, cordierite, and zirconia At least one of the group. For example, the application of any one of items 1 to 3 of the scope of patent application, wherein the inorganic binder is at least one selected from the group consisting of clay, bentonite, kaolin, and tar pitch. For example, the application of item 2 or item 3 of the patent application scope, wherein the carbonaceous powder is at least one selected from the group consisting of graphite, carbon black, activated carbon, charcoal, and coke. A method for manufacturing a liquid wick for heating evapotranspiration, which is used to contain a pyrethroid-based insecticidal component having a vapor pressure of 2 × 10 ^-4 to 1 × 10 ^-2 mmHg at 30 ° C, and a boiling point of 150 Manufacturing method of glycol ether-based compound and / or glycol-based compound at ~ 300 ° C, and water-containing prescription drug liquid evapotranspiration wick for heating and transpiration of water-based prescription drug liquid, comprising: inorganic powder and inorganic substance A mixing process in which a binder is mixed with an organic substance as a raw material; and a firing process in which the mixed raw material is fired. In the mixing process, the raw material is prepared so that the total weight of the inorganic powder and the inorganic binder ( W ₁ ), and the ratio (W ₁ / W ₂ ) to the weight (W ₂ ) of the organic substance is 4.0 to 10. For example, the manufacturing method of the liquid absorption wick for heating and transpiration in item 8 of the scope of patent application, wherein the firing process is performed at 600 to 2000 ° C. A heating evapotranspiration method for use in any one of claims 1 to 7 of the scope of patent application, by immersing the liquid wick for heating evapotranspiration in the medicinal solution, guiding the absorbed medicinal solution to the The upper part of the wick for evapotranspiration is heated at 60 to 130 ° C. to evaporate the pyrethroid insecticidal component into the atmosphere.